| /* |
| * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * KQueueSelectorImpl.java |
| * Implementation of Selector using FreeBSD / Mac OS X kqueues |
| * Derived from Sun's DevPollSelectorImpl |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.io.FileDescriptor; |
| import java.nio.channels.*; |
| import java.nio.channels.spi.*; |
| import java.util.*; |
| |
| class KQueueSelectorImpl |
| extends SelectorImpl |
| { |
| // File descriptors used for interrupt |
| protected int fd0; |
| protected int fd1; |
| |
| // The kqueue manipulator |
| KQueueArrayWrapper kqueueWrapper; |
| |
| // Count of registered descriptors (including interrupt) |
| private int totalChannels; |
| |
| // Map from a file descriptor to an entry containing the selection key |
| private HashMap<Integer,MapEntry> fdMap; |
| |
| // True if this Selector has been closed |
| private boolean closed = false; |
| |
| // Lock for interrupt triggering and clearing |
| private Object interruptLock = new Object(); |
| private boolean interruptTriggered = false; |
| |
| // used by updateSelectedKeys to handle cases where the same file |
| // descriptor is polled by more than one filter |
| private long updateCount; |
| |
| // Used to map file descriptors to a selection key and "update count" |
| // (see updateSelectedKeys for usage). |
| private static class MapEntry { |
| SelectionKeyImpl ski; |
| long updateCount; |
| MapEntry(SelectionKeyImpl ski) { |
| this.ski = ski; |
| } |
| } |
| |
| /** |
| * Package private constructor called by factory method in |
| * the abstract superclass Selector. |
| */ |
| KQueueSelectorImpl(SelectorProvider sp) { |
| super(sp); |
| long fds = IOUtil.makePipe(false); |
| fd0 = (int)(fds >>> 32); |
| fd1 = (int)fds; |
| try { |
| kqueueWrapper = new KQueueArrayWrapper(); |
| kqueueWrapper.initInterrupt(fd0, fd1); |
| fdMap = new HashMap<>(); |
| totalChannels = 1; |
| } catch (Throwable t) { |
| try { |
| FileDispatcherImpl.closeIntFD(fd0); |
| } catch (IOException ioe0) { |
| t.addSuppressed(ioe0); |
| } |
| try { |
| FileDispatcherImpl.closeIntFD(fd1); |
| } catch (IOException ioe1) { |
| t.addSuppressed(ioe1); |
| } |
| throw t; |
| } |
| } |
| |
| |
| protected int doSelect(long timeout) |
| throws IOException |
| { |
| int entries = 0; |
| if (closed) |
| throw new ClosedSelectorException(); |
| processDeregisterQueue(); |
| try { |
| begin(); |
| entries = kqueueWrapper.poll(timeout); |
| } finally { |
| end(); |
| } |
| processDeregisterQueue(); |
| return updateSelectedKeys(entries); |
| } |
| |
| /** |
| * Update the keys whose fd's have been selected by kqueue. |
| * Add the ready keys to the selected key set. |
| * If the interrupt fd has been selected, drain it and clear the interrupt. |
| */ |
| private int updateSelectedKeys(int entries) |
| throws IOException |
| { |
| int numKeysUpdated = 0; |
| boolean interrupted = false; |
| |
| // A file descriptor may be registered with kqueue with more than one |
| // filter and so there may be more than one event for a fd. The update |
| // count in the MapEntry tracks when the fd was last updated and this |
| // ensures that the ready ops are updated rather than replaced by a |
| // second or subsequent event. |
| updateCount++; |
| |
| for (int i = 0; i < entries; i++) { |
| int nextFD = kqueueWrapper.getDescriptor(i); |
| if (nextFD == fd0) { |
| interrupted = true; |
| } else { |
| MapEntry me = fdMap.get(Integer.valueOf(nextFD)); |
| |
| // entry is null in the case of an interrupt |
| if (me != null) { |
| int rOps = kqueueWrapper.getReventOps(i); |
| SelectionKeyImpl ski = me.ski; |
| if (selectedKeys.contains(ski)) { |
| // first time this file descriptor has been encountered on this |
| // update? |
| if (me.updateCount != updateCount) { |
| if (ski.channel.translateAndSetReadyOps(rOps, ski)) { |
| numKeysUpdated++; |
| me.updateCount = updateCount; |
| } |
| } else { |
| // ready ops have already been set on this update |
| ski.channel.translateAndUpdateReadyOps(rOps, ski); |
| } |
| } else { |
| ski.channel.translateAndSetReadyOps(rOps, ski); |
| if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) { |
| selectedKeys.add(ski); |
| numKeysUpdated++; |
| me.updateCount = updateCount; |
| } |
| } |
| } |
| } |
| } |
| |
| if (interrupted) { |
| // Clear the wakeup pipe |
| synchronized (interruptLock) { |
| IOUtil.drain(fd0); |
| interruptTriggered = false; |
| } |
| } |
| return numKeysUpdated; |
| } |
| |
| |
| protected void implClose() throws IOException { |
| if (!closed) { |
| closed = true; |
| |
| // prevent further wakeup |
| synchronized (interruptLock) { |
| interruptTriggered = true; |
| } |
| |
| FileDispatcherImpl.closeIntFD(fd0); |
| FileDispatcherImpl.closeIntFD(fd1); |
| if (kqueueWrapper != null) { |
| kqueueWrapper.close(); |
| kqueueWrapper = null; |
| selectedKeys = null; |
| |
| // Deregister channels |
| Iterator<SelectionKey> i = keys.iterator(); |
| while (i.hasNext()) { |
| SelectionKeyImpl ski = (SelectionKeyImpl)i.next(); |
| deregister(ski); |
| SelectableChannel selch = ski.channel(); |
| if (!selch.isOpen() && !selch.isRegistered()) |
| ((SelChImpl)selch).kill(); |
| i.remove(); |
| } |
| totalChannels = 0; |
| } |
| fd0 = -1; |
| fd1 = -1; |
| } |
| } |
| |
| |
| protected void implRegister(SelectionKeyImpl ski) { |
| if (closed) |
| throw new ClosedSelectorException(); |
| int fd = IOUtil.fdVal(ski.channel.getFD()); |
| fdMap.put(Integer.valueOf(fd), new MapEntry(ski)); |
| totalChannels++; |
| keys.add(ski); |
| } |
| |
| |
| protected void implDereg(SelectionKeyImpl ski) throws IOException { |
| int fd = ski.channel.getFDVal(); |
| fdMap.remove(Integer.valueOf(fd)); |
| kqueueWrapper.release(ski.channel); |
| totalChannels--; |
| keys.remove(ski); |
| selectedKeys.remove(ski); |
| deregister((AbstractSelectionKey)ski); |
| SelectableChannel selch = ski.channel(); |
| if (!selch.isOpen() && !selch.isRegistered()) |
| ((SelChImpl)selch).kill(); |
| } |
| |
| |
| public void putEventOps(SelectionKeyImpl ski, int ops) { |
| if (closed) |
| throw new ClosedSelectorException(); |
| kqueueWrapper.setInterest(ski.channel, ops); |
| } |
| |
| |
| public Selector wakeup() { |
| synchronized (interruptLock) { |
| if (!interruptTriggered) { |
| kqueueWrapper.interrupt(); |
| interruptTriggered = true; |
| } |
| } |
| return this; |
| } |
| } |